[spec] fix upload-artifact v4 upload error

Author: i4004

.github/workflows/build.yml

@@ -34,6 +34,7 @@ jobs:
         run: dotnet pack --no-build -c Release -o ./publish
 
       - name: Create packages artifact
+        if: ${{ matrix.os == 'windows-latest' }}
         uses: actions/upload-artifact@v4
         with:
           name: Packages